Hildegard Moniac was born on March 29, 1891 in Friedenau, Teltow.
Growing up in Berlin, she graduated in 1911.In
the period from 1913 to 1933 she worked in the city of Spreem as a commercial
high school teacher;
then it was dismissed as "politically unreliable" by the National Socialists
under § 4 of the so-called Berufsbeamtengesez.

Since the end of the 1930s she supported her sick partner
Johanna Elberskirchen in her
homeopathic practice in Rüdersdorf.
The two women had met in 1914 and lived until 1919 in Berlin.A
year later, they moved to Rüdersdorf and bought a house there in the then
Luisenstraße 32. During the Weimar Republic, Hildegard Moniac was a co-wife in
the USPD and organized together with
SPD members, the Jugendweihe in Rüdersdorf.

After the Red Army left the occupied elementary school Alt-Rüdersdorf, founded
in 1881, the school reopened on 15 October 1945 under the direction of
Hildegard Moniac.In
1951 she was transferred to the local vocational school "in the interest of
the service".As
a background to her transfer, which was accompanied by the protest by the
parenting, political motives and possibly also her homosexuality can be
suspected.In
1954 she retired from the school service due to health and age.

Until her death on August 3, 1967 at the age of 76, Hildegard Moniac lived
with her later partner Luitgarde "Luli"
Kettner (1914-1977), also a teacher at the Alt-Rüdersdorfer elementary
school, in the house on Luisenstraße.